An interface to the "trusting" nullness analysis. This variant "trusts" Nullable
annotations, similar to how a modular nullness checker like the checkerframework's would, meaning
method parameters, fields, and method returns are assumed Nullness.NULLABLE only if
annotated so.

getNullness

If the leaf required the compiler to generate autoboxing or autounboxing calls, getNullness returns the Nullnessafter the boxing/unboxing. This implies that,
in those cases, it will always return NONNULL.